Ontario Air Brake Test 04

If you are planning to take the Ontario air brake test, it is highly recommended that you first take the Ontario air brake practice test. The practice test is a valuable tool that will significantly increase your chances of passing the actual test. The practice test consists of multiple-choice questions based on the Ontario official air brake handbook. The handbook contains all the information you need to know about air brake systems, including safety-related aspects and proper maintenance procedures. Taking the practice test will give you a clear idea of your strengths and weaknesses, allowing you to focus on the areas that require further study. It is also recommended that you take the practice test multiple times to reinforce your knowledge and build your confidence. Remember, passing the Ontario air brake test is a critical step towards obtaining a commercial driver’s license, and the practice test is an excellent tool to help you achieve this goal.


Ontario Air Brake Test 04

1 / 30

When a spring brake chamber fails, a technician may use the manual caging to do what?

2 / 30

Releasing the spring brakes requires operating the control valve and then pressing the brake pedal for how many seconds?

3 / 30

A tractor parking-brake control valve is normally...

4 / 30

Often, a hand valve is also fitted on the steering column or the instrument panel of the towing vehicle so the driver can do what?

5 / 30

Many buses and motor coaches are fitted with parking and emergency brakes that do not use a large spring in the brake chamber. What is this called?

6 / 30

Which statement is false? When trailer lines are cross connected, the following can happen...

7 / 30

One connection carries air to fill the trailer's tanks and is called what?

8 / 30

What happens if you fail to close the trailer supply valve when there is no trailer attached?

9 / 30

If brakes are out of adjustment, will the spring brakes stop or hold a vehicle?

10 / 30

Most towing vehicles have receptacles that protect them from dirt and water when not in use. What are they called?

11 / 30

In most cases, the line that carries pressure for the service brakes is what colour?

12 / 30

What is another name referred to the couplers used to connect a trailer?

13 / 30

The effectiveness of a vehicle's spring brakes depends on what?

14 / 30

A DD3 brake chamber has how many air line connections?

15 / 30

Each coupler used to connect a trailer must include...

16 / 30

A spring brake control valve is normally what type of valve?

17 / 30

What does a tractor parking-brake control valve do?

18 / 30

How can disabled or caged spring brake chambers be recognized?

19 / 30

What are almost all commercial vehicles use a type of brake chamber that is held together by?

20 / 30

To prevent air loss from gladhands when they are not in use, what are the lines usually equipped with?

21 / 30

Vehicles that are designed to tow trailers must be fitted with additional...

22 / 30

The tractor protection valve does what?

23 / 30

The other trailer connection carries pressure for the service brakes and is called what?

24 / 30

The brake system that attaches one trailer to another is called what?

25 / 30

How much air pressure must be supplied to the spring brake chamber to compress the spring in order to release it?

26 / 30

A technician can manually compress or 'cage' the spring in a spring brake chamber by using what?

27 / 30

In most cases, the line that carries air to fill the tanks is what colour?

28 / 30

When the hand valve and brake pedal are used at the same time, which brakes receive the higher pressure?

29 / 30

What causes sudden automatic application of the spring brakes and an uncontrolled vehicle stop?

30 / 30

What is another word used when the springs are compressed?

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